Metallic-circuit cable



(N0 MOM-3L) C. E. JACKSON.

METALLIC GIRGUIT CABLE.

No. 476,464. Patented June 7,1892.

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CJkwrZes Emory UNITED STATES PATENT OFFICE.

CHARLES E. JACKSON, OF BOSTON, MASSACHUSETTS.

METALLIC-.CIRCUIT CABLE.

' SPECIFICATION forming part of Letters Patent No. 476,464, dated June'7, 1892.

Application filed November 12, 1891. Serial No. 4:11 702| (N0 model.)

T0 at whom it may concern.-

Be it known that 1, CHARLES E. JACKSON, of Boston, county of Suifolk,State of Massachusetts, have invented an Improvement in MetallicCircuits, of which the following description, in connection with theaccompanying drawing, is a specification, like letters and figures 011the drawing representinglike parts.

This invention has forits object to provide an improved metalliccircuit.

In accordance with this invention a metallic conducting-wire is coveredwith one or more layers of insulation, about which are wound spirallytwo preferably-fiat conducting-strips,one of which is wound over and tocover the space between the spiral turns of the other strip, the wholebeing preferably covered with an insulating substance.

One part of the invention therefore consists in the combination, with aninsulated conductor, of two metal strips wound spirally about the same,one of the said strips being wound over and upon and to cover the spacebetween the turns of the other of said strips, the successiveconvolutions of each strip being separated, substantially as will bedescribed.

The drawing represents a conductor embodying this invention.

A represents a conductor covered with one or more layers or windings ofinsulation Z) b, about which is wound spirally the strip 0. A

second strip (Z is wound spirally over and upon the said strip 0 and tocover the space 5 between the successive spiral windings or turns of thesaid strip 0, so that a current of electricity sent over the strip 0will not be compelled to follow the spiral turns thereof, whichnecessarily increase the resistance, but may pass from one turn to theother through the outer strip 01, and thus pass in a substantiallydirector straight line along the conductor. An outer coating ofinsulation 6 is also preferably provided, as shown. If the outer coatingof insulation 6 should be injured or destroyed at any point by reason ofthe conductor chafing against a building or tree, the insulation 1),which separates the inner conductor A from the outer strips 0 (Z, willstill be preserved from injury by the overlapping windings of the saidouter strips, which effectually exclude all air and moisture from theinsulation beneath. Should it not be desired to utilize thespirallywvound strips 0 (Z as conductors, they may be employed withadvantage as a flexible metallic armor for the conductor A to protectthe latter and to pre vent abrasion, to which insulated conductors aresubject, and to this end the said armorstrips are adapted for use inconnection with underground and submarine cables and the like.

I claim The combination, with an insulated conductor, of two metallicstrips wound spirally about the same, one of said strips being woundover and upon and to coverthe space between the turns of the other ofsaid strips, the successive convolutions of each strip being separated,substautially as described.

In testimony whereof I have si ned my name to this specification in thepresence of two subscribing witnesses.

CHARLES E. JACKSON.

\Vitnesses:

FREDERICK L. EMERY, EMMA J. BENNETT,

